/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2020, Arnaud Roques
 *
 * Project Info:  http://plantuml.com
 * 
 * If you like this project or if you find it useful, you can support us at:
 * 
 * http://plantuml.com/patreon (only 1$ per month!)
 * http://plantuml.com/paypal
 * 
 * This file is part of PlantUML.
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PlantUML distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
 * License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 *
 * Original Author:  Arnaud Roques
 * 
 *
 */
package net.sourceforge.plantuml.project.time;

public class MonthYear implements Comparable<MonthYear> {

	private final int year;
	private final Month month;

	public static MonthYear create(int year, Month month) {
		return new MonthYear(year, month);
	}

	public String shortName() {
		return month.shortName();
	}

	public String shortNameYYYY() {
		return month.shortName() + " " + year;
	}

	public String longName() {
		return month.longName();
	}

	public String longNameYYYY() {
		return month.longName() + " " + year;
	}

	private MonthYear(int year, Month month) {
		this.year = year;
		this.month = month;
	}

	public int year() {
		return year;
	}

	public MonthYear next() {
		final Month newMonth = month.next();
		final int newYear = newMonth == Month.JANUARY ? year + 1 : year;
		return new MonthYear(newYear, newMonth);
	}

	public Month month() {
		return month;
	}

	private int internalNumber() {
		return year * 100 + month.ordinal();
	}

	@Override
	public String toString() {
		return "" + year + "/" + month;
	}

	@Override
	public int hashCode() {
		return year * 113 + month.hashCode();
	}

	@Override
	public boolean equals(Object obj) {
		if (obj == null) {
			return false;
		}
		final MonthYear other = (MonthYear) obj;
		return other.internalNumber() == this.internalNumber();
	}

	public int compareTo(MonthYear other) {
		return this.internalNumber() - other.internalNumber();
	}

}
